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Abstract

Collapsible soils consist of loose, dry, low-density materials that collapse and compact under the addition of water or excessive loading. These soils are distributed throughout the world, specifically in areas of young alluvial fans, debris flow sediments, and loess (wind-blown sediment) deposits. The basic objectives of this study are to describe the properties and characteristics of collapsible soils such as: Origin and occurrence, structure, and composition of collapsible soils. This study also investigates the collapsibility characteristics and behavior of the materials with particular reference to their response to wetting under different stress levels. Undisturbed soil samples from Najran area situated in the south of Saudi Arabia have been collected and studied by using both single and double oedometer tests. The results show that the highest value of collapse potential (CP=11.07%) of Najran soil as given by double Oedometer tests which represents a severe trouble according to [1].

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